Container comprising a body and a cover

ABSTRACT

The invention concerns a container having a barrel-like body and a fitting sealed lid which during transport and storage prevents contamination of the content, which permits multiple opening and closing without losses of sealing integrity and which manages without an elastomeric seal as an additional material component, which is distinguished in that at least in the braced condition the lid bears sealingly with respect to the body against at least two mutually spaced sealing locations which are peripherally continuous in an annular shape around the axis of symmetry of the container.

I. FIELD OF USE

[0001] The invention concerns a container with a barrel-like body and afitting, sealed lid.

II. TECHNICAL BACKGROUND

[0002] It is the usual practice nowadays for the homopolymers andcopolymers of tetrafluoroethylene (TFE) in powder form to be put intobarrel-like plastic containers or fiber drums, preferably with apot-shaped body and a lid which fits thereon. The function of thecontainers is to protect the above-mentioned polymers which arefrequently produced and processed under clean room conditions from dustand moisture as well as pressure loadings. Foreign substances of anykind, moisture and polymer particles which are compacted by a pressureloading, upon processing of the TFE polymers, result in flaws in theextrudates or molded bodies produced therefrom, which are not acceptablein particular when dealing with thin-gauge products such as wirecoatings or films.

[0003] For high-quality end uses, plastic containers, for examplecomprising polypropylene, are preferred over fiber drums, for thepackaging of polytetrafluoroethylene (PTFE) powders, because they afforda better surface quality and the operation of inserting an inner film orfoil bag for protecting the powders can be avoided.

[0004] High demands of varying kinds are made on the plastic containers;they must afford sufficient sealing integrity, even when they are openedand closed a plurality of times. Moreover, in accordance withDE-U-9408630, they must withstand the loading pressure which occurs whenin the filled condition they are stacked one upon the other, on theindividual packaging units. In practice, between two and four palletstacks are stacked one upon the other, which in turn are loaded withbetween two and three layers of containers. The containers are filledwith between 20 and 50 kg of powder. Certain filling heights in thecontainer should not be exceeded in the filling procedure as otherwisethe powder can suffer from caking together and there is no guarantee offault-free processing thereof.

[0005] Containers for PTFE powder in their technically complicated,high-quality configurations are preferably produced by injectionmolding. In that case, mass plastic materials such as polypropylene orpolyethylene are used for reasons of price. As a high level of strengthis required on the part of the containers for transportation andstorage, even at temperatures of between −20° C. and 60° C., chemicallymodified propylene copolymers are preferably used as the material here.The packaging systems are of high value so that the aim is to achievere-use, for example by cleaning and re-filling.

[0006] Quite particular demands are made on the sealing system for thecontainers for PTFE powder. In comparison with the known one-lid system,for example for paint, the packaging system disclosed in EP-B-362 959 isa round three-component system comprising the container body, the lidand a clamping ring. The sealing principle here provides that the upperpart of the body terminates in an outwardly downwardly inclinedconfiguration, whereas thin peripheral lugs in the inside edge of thelid are pressed on to the upper portion of the body by means of theclamping ring. The restoring moment of those peripheral lugs however isslight so that after the container has been first opened and re-closed,sealing integrity drops off severely. Re-use of the lid and recycling ofthe container is in practice not possible.

[0007] In addition, production of the thin sealing lips by means of theinjection molding process is technically very expensive and susceptibleto trouble as complicated and expensive venting means must be providedin the injection molding tool, for completely forming the thin sealinglips by the injection molding action. In the injection molding processfor example polymer deposits can cause complete or partial clogging ofthe venting regions, which results in the thin peripheral lugs not beingcompletely formed by injection molding, so that the sealing function isno longer guaranteed.

[0008] Similarly, that form of sealing arrangement with thin peripherallugs at the inner edge of the lid is described in WO-A-96/37410, for arectangular plastic container.

[0009] U.S. Pat. No. 4,674,650 describes a sealing arrangement for around container of plastic material, comprising a container body, a lidand a clamping ring. The seal is made by a sealing ring which isadditionally fitted in the lid and which seals off the outwardlydisposed, inwardly directed body. Introducing an additional sealing ringcomprising an elastic material suffers from various disadvantages: itmakes the system more expensive, it causes increased difficulty inautomatically cleaning off the packaging system prior to use, and upondisposal of the packaging system it has to be separated as an additionalmaterial component if the container material is to be fed to a recyclingprocess.

[0010] In the case of a commercially available packaging systemcomprising a container body, a lid and a clamping ring, from Sulo PlastGmbH & Co KG, a seal is made by an elastomer seal, for example ofpolyurethane, being cast into a groove provided in the lid. Thatelastomer seal seals against the upper edge of the body. The essentialdisadvantage of that system is that the elastomer seal can be damagedunder the loading pressure on the elastomer seal upon transportation andstorage. Parts of the seal are detached and can pass into the PTFEpowder to be protected. In this case also, the elastomer component hasto be separated off if, after use of the packaging system, the containerlids are fed to a recycling process.

III. SUMMARY OF THE INVENTION

[0011] a) Technical Object

[0012] The object of the present invention is to provide a containerhaving a sealing means which excludes contamination of the contentduring transportation and storage, which permits multiple opening andclosing without losses of sealing integrity and which manages without anelastomer seal as an additional material component.

[0013] b) Attainment of the Object

[0014] That object is attained by the characterising features ofclaim 1. Advantageous embodiments are set forth in the appendant claims.

[0015] The at least two sealing locations which are spatially separatedfrom each other—and which are also in particular movable relative toeach other—afford on the one hand a higher degree of sealing reliabilityand on the other hand, by virtue of the relative mobility of the sealinglocations relative to each other, that is to say either the sealing legswhich are active at the sealing locations or the sealing surfaces whichpress thereagainst—they afford a high probability that sealing integrityis achieved at both sealing locations.

[0016] By virtue of the pot-shaped container which is open at one endand the lid which fits thereon, the sealing locations are always of aperipherally extending closed configuration, irrespective of whether thebasic shape of the container is round or polygonal.

[0017] Furthermore hereinafter the first sealing location is describedin such a way that in that case the sealing surface (groove) is providedin the lid and the sealing leg or arm (upper edge of the wall of thebody) is provided on the container, while that association is preciselythe reversed in regard to the second sealing location (flange).

[0018] In regard to one or also all of the two sealing locations, theassociation of the sealing surface and the sealing leg with the body andthe lid respectively may also be reversed, that is to say for examplethe free upper end of the edge of the body can be grooved in a V-shape,in which a suitable projection on the lid could engage.

[0019] By virtue of the high sealing probability for each individualsealing location, and thus definitely the high level of sealingcertainty for the container by virtue of a plurality of separate sealinglocations and the mobility relative to each other, it is possible torisk the body and the lid bearing against each other at the sealinglocations directly, that is to say without the interposition of aspecial, more elastic sealing material, with the advantage of greaterease of recycling and a reduced risk of contamination of the contentsdue to constituents of the sealing material coming away.

[0020] By virtue of adequate axial spacing of the sealing locations, thedistance can be put to use for length compensation purposes and therebythe sealing probability at both sealing locations can be enhanced. If inaddition at least one of the sealing locations is divided into aplurality of partial sealing locations, that further enhances thesealing probability, even if the for example sealing legs of the partialsealing locations are not or scarcely movable relative to each other.

[0021] The following description only ever refers to the cross-sectionalshapes of the corresponding locations on the lid and the bodyrespectively. These however are always of a ring-shaped peripherallyextending configuration, corresponding to the ring-shaped peripherallyextending—round or polygonal or free-shaped—shape of the body, that isto say the peripheral walls thereof, when viewed in plan.

[0022] In a preferred embodiment the first sealing location comprisesthe free upper end of the edge of the body, in the form of a sealing armor leg, on to which fits a groove which is of preferably V-shapedcross-section and which is provided in the underside of the lid. Thatgroove region of the lid, which forms the groove, goes radially inwardlyinto the main portion of the lid, the central region, and on the outsideinto a connecting region which, on the outside of the wall, is directedparallel thereto or inclinedly, for example with an increasing spacing,in an outward and downward direction.

[0023] At the lower end, the connecting region forms a transition into alid edge which is of a fork-shaped or U-shaped cross-section withdownwardly facing free ends, being the sealing legs.

[0024] Those sealing legs can be pressed with their free ends against anupwardly facing sealing surface, by means of a clamping device, whichrepresents the top side of a flange which projects outwardly from thewall of the body.

[0025] In this case, the sealing surface which extends peripherally in aring shape and against which the sealing leg or legs bear, can extendhorizontally, that is to say precisely perpendicularly to thelongitudinal direction of the container, generally the axis of symmetryof the body and the lid, or inclinedly relative thereto, for example insuch a way as to fall away radially inwardly, that is to say with anincreasing spacing in the longitudinal direction with respect to thefreely terminating edge of the body.

[0026] The lid and the body are pressed against each other, inparticular at the two sealing locations, by a clamping device,frequently a clamping ring which embraces both the edge of the lid andalso the adjacent flange of the body, in a radially inward direction.

[0027] In this case, the clamping ring has a radially inwardly opengroove which is provided with inclined flanks and the inside surfaces ofwhich become increasingly spaced from each other, from the bottom of thegroove to the open end thereof, that is to say radially inwardly in theassembled condition thereof.

[0028] In the same manner the rear sides of both the edge of the lid andalso the flange, which are remote from the sealing surface, are also ofan inclined configuration.

[0029] The upwardly facing rear side of the edge of the lid thus fallsaway inclinedly downwardly from the inside outwardly, while thedownwardly directed rear side of the flange rises inclinedly from theinside outwardly, corresponding to the inclination of the inside flanksof the clamping ring relative to each other.

[0030] In that case, the probability of the two sealing locationsbearing sealingly against each other is greatly increased by mobility ofthe elements forming the two sealing locations, either on the part ofthe lid or on the part of the body.

[0031] In practice, the annular flange is arranged between 10 mm and 100mm, in particular 30 mm, below the edge of the body, and projectsradially outwardly between 10 mm and 50 mm, in particular 20 mm. Theperipherally extending sealing legs which can be arranged on the annularflange of the body or at the edge of the lid are between 1 mm and 15 mmand in particular 3.5 mm high and between 1 mm and 10 mm and inparticular 3 mm wide.

[0032] c) Embodiments

[0033] Embodiments in accordance with the invention—with differentdimensional relationships between the lid and the edge of the body—aredescribed in greater detail with reference to the Figures in which:

[0034] FIGS. 1 show the lid disposed on the body in the relaxed and inthe braced condition with a large axial extent in respect of the lid,

[0035] FIGS. 2 show the lid disposed on the body in the relaxed and inthe braced condition with a small axial extent in respect of the lid,and

[0036]FIG. 3 show a third variant of the container.

[0037]FIGS. 1 and 2 respectively show in section along the longitudinalaxis, the axis of symmetry 10, of the body 1 and the lid 2, the contactthereof against each other, more specifically in FIGS. 1a and 2 a withthe lid loosely fitted on the body and in FIGS. 1b and 2 b with the lidbraced against the body, with a clamping ring 3 serving as the clampingdevice.

[0038] What is common to both the designs in FIGS. 1 and 2 is the basicconfiguration of the cross-sectional shape of the lid, in particular theedge of the lid, and the upper region of the wall of the body 1: boththe lid and also the body, considered in plan, are symmetrical withrespect to the axis of symmetry 10 which is intended at the same time todefine the longitudinal direction, thereby forming peripherally closedcontainers, insofar as the single open end of the body can be sealinglyclosed by the lid. In general the body and the lid are rotationallysymmetrical.

[0039] The wall 7 of the body 1 is preferably of a smooth-surfacednature on the inward side, for more easily filling, emptying andcleaning the interior of the container.

[0040] On the outward side, set back from the freely terminating edge 1a of the body, the body has a peripherally extending annular flange 8which projects radially outwardly.

[0041] The edge 1 a of the body, that is to say the wall in particularabove the annular flange, can be somewhat thicker in this respect thanbeneath the annular flange, but generally not thicker than 3 mm.

[0042] In cross-section in the radial region of the body edge 1 a, thelid 2 is of a U-shape or a V-shape with an annular groove 6 which isopen downwardly, that is to say towards the body, and with which the lid2 can be laid on the edge 1 of the body.

[0043] Radially within that U-shaped or V-shaped groove region 2 c, thelid forms a one-piece transition into a central region 2 d which is thusset downwardly with respect to the groove region 2 c. The radiallyoutward limb of the groove region 2 c is either prolonged in the axialdirection or in an inclinedly outwardly enlarging configuration, bymeans of a connecting region 2 b. The edge 2 a of the lid is provided inone piece at the lower outer free end of the connecting region 2 b. Theedge 2 a of the lid is thus still disposed under the central region 2 dof the lid in the axial direction in the fitted condition.

[0044] The edge 2 a of the lid has sealing legs 11 b, 11 c which facedownwardly and which terminate freely and which also again extendperipherally in a closed configuration.

[0045] When the lid is braced with respect to the body, the sealingaction is to be implemented at two different sealing locations 4, 5;

[0046] The freely terminating body edge 1 a which bears against the lidin the groove 6 thereof represents the first sealing location 4. Thesealing legs 11 b, 11 c of the 11 d edge 2 a, which bear against the topside of the annular flange 8 of the body, represent the second sealinglocation which is subdivided into two partial sealing locations 5 a, 5 bby the sealing legs 11 b, 11 c which extend in mutually concentricrelationship.

[0047] The bracing action is effected by virtue of the fact that, at thesecond sealing location 5, the rear sides which respectively face awayfrom the sealing location, more specifically the upwardly directed rearside 13 of the edge 2 a of the lid and the downwardly directed rear side14 of the flange 8, extend at an acute angle and come closer to eachother as they extend in a radially outward direction.

[0048] The lid 2 is braced and sealed with respect to the body 1 bypushing on a clamping ring 3 with a suitably conical clamping groove 19which is open in a radially inward direction and which is so dimensionedthat, when the clamping ring 3 is pushed on, the clamping groove notonly bears inwardly against the rear sides 13, 14 of the edge 2 a of thelid and the flange 8, but also presses them against each other in theaxial direction.

[0049] In that respect, it is inter alia of significance for the edge 2a of the lid with its sealing legs 11 b, 11 c to be relatively strongand stable in itself. The same applies in regard to the groove region 2c which for that purpose, in particular in the region of the bottom ofthe groove, can be of a wall thickness which is at least doubled inrelation to the normal wall thickness for example of the central region2 d, and in addition has an extension portion 2 e which affords anadditional stabilising effect on the rear side of the groove, that is tosay facing upwardly.

[0050] In contrast, the edge 2 a of the lid is definitely movable withrespect to the groove region 2 c, for example by virtue of a reducedthickness of material in the configuration therebetween, in particularat the respective transitions between the groove region 2 c and theconnecting region 2 b, and the connecting region 2 b and the edge 2 a ofthe lid.

[0051] In that way for example the lid edge 2 a can be pivoted somewhatdownwardly with respect to the connecting region or the entireconnecting region can be pivoted somewhat radially inwardly with respectto the groove region.

[0052] It is also important for the edge 1 a of the body, in particularthe entire section of the wall 7 from the flange 8 to the free end, tobe sufficiently strong and stable, and in particular to be thicker inwall thickness than the remainder of the wall 7, so that the edge 1 a ofthe lid can admittedly be bent inwardly or outwardly at its free end ina radial direction, but only when a relatively large amount of force isapplied.

[0053] The outwardly directed flange 8 is also of a very strong andstable nature, and in particular is stabilised by legs 15 which extendradially outwardly at the underside.

[0054] The clamping ring 3 comprises for example metal or plasticmaterial and can be reduced in its diameter by tangentially fittedclamping screws, lever fasteners or others of the known possibleoptions.

[0055]FIGS. 1 and 2 differ by virtue of the relationship of the spacingsA and B respectively, to be defined hereinafter, in regard to the lidand the body:

[0056] Those spacings which are to be measured in the longitudinaldirection, that is to say parallel to the axis of symmetry 10, aredefined as follows in the unbraced rest condition of the body and thelid respectively: the spacing A in the case of the lid is the axialextent between the bottom of the groove 6 and the furthest downwardlyprojecting sealing leg 11 b, 11 c of the edge 2 a of the lid.

[0057] The spacing B in the case of the body is to be the spacingbetween the free upper end of the edge 1 a of the body and the upwardlyfacing sealing surface 12 b of the flange.

[0058] While, as shown in FIG. 1, the spacing B is somewhat larger thanthe spacing A, this is precisely the opposite in FIG. 2a. Thosediffering relationships and the situations resulting therefrom can bedeliberately selected or can occur by virtue of production tolerances inmanufacture of the lid and the body respectively, which is generallyimplemented by an injection molding process.

[0059] If the lid spacing A is greater than the body spacing B, as inFIG. 1a, then when the lid is loosely fitted on to the body, the grooveregion 2 c thereof sits with a flank or the bottom of the groove 6 onthe free, upwardly facing end of the edge 1 a of the body, without thedownwardly facing sealing legs 11 b, 11 c of the edge 2 a of the lidreaching the upwardly facing sealing surface 12 b of the flange 8, thesealing surface 12 b generally extending at a right angle to the axis ofsymmetry 10.

[0060] If in that case—by virtue of differences in diameter—the edge 1 aof the body does not lie in the bottom of the groove 6 of the lid 2, butbears, spaced therefrom radially inwardly or preferably outwardly,against one of the flanks of the groove 6, the spacing between the edge2 a of the lid and the flange 8 at the second sealing location 5 becomeseven greater.

[0061] As FIG. 1a shows, the lower free ends of the concentricallyextending sealing legs 11 b, 11 c are not disposed in this case at onelevel, but, because of a slightly outwardly rising inclined position ofthe edge 2 a of the lid and also a slightly downwardly outwardly facinginclined position of the connecting region 2 b of the lid 2, theradially inwardly disposed sealing leg 11 b extends somewhat furthertowards the sealing surface 12.

[0062] By fitting the clamping ring 3, that is to say moving it radiallyinwardly and thus causing the conical inside flanks of the clampinggroove 19 of the clamping ring 3 to bear against the rear sides 13 and14, which face outwardly from the clamping location 5, of the edge 2 aof the lid and the flange 8 of the body 1, the edge 2 a of the lid is onthe one hand moved radially inwardly and on the other hand at the sametime and/or instead thereof is urged axially against the sealing surface12 b of the flange, that is to say downwardly. That is effected byvirtue of the mobility of the edge 2 a of the lid with respect to theremainder of the lid 2, in particular with respect to the groove region2 c, and in particular by virtue of bending or turning of the individualparts of the lid, about the transitions 17 and 18, which are of smallerwall thickness, on both sides of the connecting region 2 b.

[0063] Solely by virtue of the radially inward movement of the edge 2 aof the lid and the approach of the transitional region 2 b from theinclined position to the parallel position, with respect to the axialdirection, at least one of the sealing legs 11 b, 11 c, with its freeend, reaches the sealing surface 12 b of the flange 8, whereby a sealingaction is produced at that second sealing location 5. As shown in FIG.1b, in that case the radially outwardly disposed sealing leg 11 c bearswith its entire end face against the sealing surface 12 b while theradially inwardly disposed sealing leg 11 b involves only line contactwith the sealing surface 12 b.

[0064] The axial movement of the edge 2 a of the lid also provides that,at the first sealing location 4, the groove 6 and in particular thecontact point thereof at the flank is pressed against the edge 1 a ofthe body, and thus enhanced sealing integrity is also achieved at thefirst sealing location 4.

[0065] If in addition the sealing surface 12 b does not extendperpendicularly to the axis of symmetry 10 but adopts a radiallyinwardly increasing spacing from the upper free end of the edge 1 a ofthe body, with the contact point under some circumstances moving in thedirection of the bottom of the groove and the edge 1 a being slightlyradially deformed, by virtue of an inclined positioning, as shown inbroken line in FIG. 2b, that axial bracing effect is still furtherincreased.

[0066] In contrast thereto, in FIG. 2a the spacing A of the lid 2 isgreater than the spacing B of the body 1. When therefore the lid 2 isloosely laid on the body, the edge 2 a of the lid lies on the sealingsurface 12 b of the flange 8 and, because of the weight of the lid, theedge 2 a of the lid is thereby bent somewhat around the transition 18 tothe connecting region 2 b, so that only the radially inward sealing leg11 b will lie on the sealing surface and the radially outer sealing leg11 b will be lifted somewhat off the sealing surface 12 b.

[0067] In addition, at the first sealing location 4, the bottom of thegroove 6 will not reach the free end of the edge 1 a of the lid, unlessit is not aligned in the radial direction with the bottom of the groovebut is displaced radially outwardly or inwardly and thus already bearsagainst one of the flanks of the groove 6.

[0068] By virtue of the clamping ring 3 being fitted in a radiallyinward direction, the edge 2 a of the lid is initially displacedradially inwardly along the sealing surface 12 b and, when that happens,it additionally also provides that both sealing legs 11 b, 11 c of theedge 2 a of the lid bear against the sealing surface 12 b of the flange8 of the body 1.

[0069] By virtue of that radially inward displacement, the connectingregion 2 b which adjoins the edge 2 a of the lid is also displacedradially inwardly and thereby causes the edge 1 a of the body to bear atleast against the radially outer flank of the groove 6, and thus asealing effect also occurs at that first sealing location 4.

[0070] A further possible option is shown in FIGS. 3a and 3 b:

[0071] While in the structures shown in FIGS. 1 and 2 the wall thicknessof the edge 1 a of the body was markedly less than the width of thebottom of the groove 6 in the lid, the reverse is the case in thestructure shown in FIG. 3:

[0072] The wall thickness of the edge 1 a of the body, at least at thefree end thereof, is so great that it cannot in any way penetrate intothe groove 6 so far that the bottom of the groove is reached.

[0073] Thus, when the lid is loosely fitted, the edge 1 a of the bodyalready bears with its end region against both flanks of the groove 6while the sealing legs 11 of the edge 2 a of the lid still do not reachthe sealing surface 12 b of the flange 8. It is only by pushing on theclamping ring as shown in FIG. 3b that the edge 2 a of the lid is pulledradially inwardly, in particular however also in an axial directiondownwardly on to the sealing surface 12 b against which the sealing legs11 b, 11 c now bear. That axial bracing effect also causes the free endof the edge 1 a of the body to be pushed further into the groove 6 andalso expanded slightly—depending on the respective stability of thegroove region 2 c. On the radially inward side, that results in slightdeformation of the central region 2 d of the lid to afford a camberedshape while on the radially outward side it results in inclinedpositioning of the outer limb of the groove region 2 c and theconnecting region 2 b.

[0074] That however is compensated by radially inward displacement ofthe edge 2 a of the lid by the clamping ring 3, and the existingmobility of the edge of the lid with respect to the groove region 2 c byvirtue of the longitudinal extent of the connecting region 2 b and/orthe mobility afforded by virtue of the reduced-thickness transitions 17and/or 18 of the connecting region 2 b with respect to the adjoiningregions. List of references  1 body  1a edge of the body  2 lid  2a edgeof the lid  2b connecting region  2c groove region  2d central region 2e extension portion  3 clamping ring  3a groove  4 sealing location 5a, b partial sealing location  6 annular groove  7 wall  8 annularflange  9 10 axis of symmetry 11a, b, c sealing leg 12a, b sealingsurface 13 rear side 14 rear side 15 legs 16 bottom 17 transition 18transition 19 clamping groove

1. A container comprising a body (1) and a lid (2), as well as aclamping device for sealingly bracing the lid (2) with respect to thebody (1), characterised in that at least in the braced condition the lid(2) bears sealingly with respect to the body (1) against at least twomutually spaced sealing locations (4, 5) which are peripherallycontinuous in an annular shape around the axis of symmetry (10) of thecontainer.
 2. A container as set forth in claim 1 characterised in thatthe body (1) and the lid (2) each only consist of a single material, inparticular plastic material, in particular the same plastic material. 3.A container as set forth in one of the preceding claims characterised inthat the sealing locations (4) and (5) are arranged axially spaced fromeach other.
 4. A container as set forth in one of the preceding claimscharacterised in that the sealing locations (4) and/or (5) are dividedinto partial sealing locations (5 a, 5 b).
 5. A container as set forthin one of the preceding claims characterised in that at the sealinglocations (4) and (5) or the partial sealing locations (5 a, 5b)respectively a sealing leg (11) presses with its outside surface, inparticular with line contact, against a sealing surface (12) and ismovable along said sealing surface (12) by virtue of the bracing effectby means of the clamping device.
 6. A container as set forth in one ofthe preceding claims characterised in that at the first sealing location(4) the sealing leg (11 a) is the freely ending edge (1 a) of the bodyand the sealing surface (12 a) is an annular groove (6) of V-shapedcross-section in the underside of the lid (2).
 7. A container as setforth in one of the preceding claims characterised in that at thesealing location (5) the sealing surface (12) is an annular surface,which extends transversely with respect to the axis of symmetry (10) andwhich is arranged outside the wall (7) of the body (1), on a radiallyoutwardly facing annular flange (8), and the sealing leg (11 b) is asealing leg which extends peripherally in a ring configuration and whichis provided in one piece with the outer edge (2 a) of the lid.
 8. Acontainer as set forth in claim 7 characterised in that the edge of thelid has two radially spaced, mutually concentrically arranged sealinglegs (11 b, 11 c) which bear against the same sealing surface (12 b) inthe braced condition.
 9. A container as set forth in one of thepreceding claims characterised in that the edge (2 a) of the lid, atleast in the connecting region between the sealing legs (11 b, 11 c), isof such a stable nature that no substantial deviation from the annularshape of the edge (2 a) of the lid can be produced by clamping of theclamping device.
 10. A container as set forth in one of the precedingclaims characterised in that the sealing surface (12 b) extendsperpendicularly to the axis of symmetry (10).
 11. A container as setforth in one of the preceding claims characterised in that the sealingsurface (12 b) is arranged at an acute angle, in particular, in the caseof a sealing surface (12 b) facing towards the open end of the body (1),in such a way as to fall away radially inwardly towards the bottom ofthe body (1).
 12. A container as set forth in one of the precedingclaims characterised in that considered in cross-section the lid (2)comprises radially outwardly a plate-shaped central region (2 d), agroove region (2 c) which is curved up axially outwardly in a U-shape,an annular connecting region (2 b) adjoining the radially outward freeend of the groove region, and the adjoining edge (2 a) of the lid, whichare provided in one piece with each other, and wherein the transitionbetween the connecting region (2 b) and at least one of the adjoiningregions is of a smaller wall thickness than the other regions.
 13. Acontainer as set forth in one of the preceding claims characterised inthat the edge (2 a) of the lid is arranged radially outside theconnecting region (2 b).
 14. A container as set forth in one of thepreceding claims characterised in that the connecting region (2 b)extends axially.
 15. A container as set forth in one of the precedingclaims characterised in that the annular groove (6) has a half-roundbottom and the bottom of the groove is wider than the wall thickness ofthe body edge (1 a) which is also rounded.
 16. A container as set forthin one of the preceding claims characterised in that the free end of theedge (1 a) of the body in the form of a sealing leg (11 a) of the firstsealing location (4) assumes, from the sealing surface (12 b) of thesecond sealing location (5), an axial spacing which is slightly largerthan the bottom of the annular groove (6) from the free end of thesealing leg (11) or (11 b) and (11 c) in the unstressed condition of thelid.
 17. A container as set forth in one of the preceding claimscharacterised in that the diameter of the body (1), measured from thewall center to the wall center at the free end, that is to say at theedge (1 a) of the body, differs from the diameter of the annular groove(6) of the lid (2), measured from the center of the bottom of the grooveto the center of the bottom of the groove, and in that respect thediameter of the body is preferably greater than the diameter of theannular groove (6) so that when the lid is fitted without bracing thelid is supported with its outer flank of the annular groove on the edge(1 a) of the body.
 18. A container as set forth in one of the precedingclaims characterised in that the clamping device is a clamping ring (3)with a radially inwardly directed groove (3 a) whose flanks move awayfrom each other towards the free inner end.
 19. A container as set forthin one of the preceding claims characterised in that the rear side (13)of the edge (2 a) of the lid, which faces away from the flange (8), andthe rear side (14) of the flange (8), which faces away from the lid, areshaped conically corresponding to the internal flanks of the annulargroove (3 a) of the clamping ring (3).
 20. A container as set forth inone of the preceding claims characterised in that the conical rear sideof the flange (8) of the body (1) is formed at least by legs (15) of theflange (8), which are arranged distributed over the periphery.
 21. Acontainer as set forth in one of the preceding claims characterised inthat the wall thickness of the body (1) at the edge (1 a) of the body,in particular from the flange (8) to the free end, is greater thanbetween the flange (8) and the bottom (16) of the body.
 22. A containeras set forth in one of the preceding claims characterised in that theannular groove (6) has an intermediate angle between its outer flank (6a) and its inner flank (6 b) of 5-50°, in particular 10-30°.
 23. Acontainer as set forth in one of the preceding claims characterised inthat the annular groove (6) in the lid (2) has a bottom which isnarrower than the wall thickness of the edge (1 a) of the body at thefree end.
 24. A container as set forth in one of the preceding claimscharacterised in that the connecting region (2 b) of the lid enlargesconically from the groove region (2 c) to the edge (2 a) of the lid.